Lubricant for automotive engines



' gasoline as a Patented Aug. 16, 1927.

UNITED STATES PATENT OFFICE.

LUTHER B. LOCKHART, or

rm, or wnrrme,

LUBRICANT FOR AUTOMOTIVE ENGINES.

No Drawing.

This invention relates to a composition of matter for use in lubricating internal combustion engines, particularly of the type employed in automotive vehicles employing fuel and in which constituents of the fuel enter the lubricant in the crankcase. It is particularly adapted for use in cold Weather, facilitating starting and lubrication of the bearings of the motor when fresh and suffering-little or practically no loss or viscosity by dilution in an average car in ordinary winter operation with proper carburetor adjustment.

The lubricant oil of my invention is clear in appearance, and free from suspended solids, colloidal carbon and marked disagreeable odor. It has a viscosity of not less than 140 seconds Saybolt at 100 F., a flash 'point in excess of 110 F., and preferably 2 above 150 F., and on distillation yields from 5 to 15% (and preferably from 7 to 15%) of fractions boiling above 300 F. and below 460 F. Such an oil adequately lubricates the bearings of the motor while cold, and shows very little if any loss in viscosity during use, and particularl during the first 100 miles of operation, t ereby differing markedly from oils previousl known. A preferred oil in accordance wit this invention is one having a viscosity of about 184 seconds siybolt at 100 F. a flash point of about 150 and containing about 8% of fractions boiling between 320 and 450 F., the remainder having a viscosity of 340 to 350.

Such an oil may be produced by an admixing with 92 parts of a viscous' lubricant oil, for example,'of parafiintype or a midcontinent oil, having a viscosity of 340 to 40 350 sec. Saybolt at 100 F. about 8 arts of a light distillate oil having a boiling point range of 320 to 460 F.

It is, of course, apparent that the composition of the oil may be varied within wide Application filed February 20, 1926. Serial No. 89,764.

limits and still retain the principles of the invention embodied herein. The specific details above set forth are not intended to be regarded as limitations upon the scope of the invention, except in so far as included in the accompanying claims.

I claim:

1. The herein described marketable lubricating oil for cold Weather use in automotive engines of the type in which liquid fuel enters the oil from the cylinders, clear in appearance, free from suspended solids, colloidal carbon and marked disagreeable odor, and characterized further by having a flash point above 150 F. a Saybolt viscosity of at least 140 at 100 ll, a relatively low loss in viscosity during use and a content of between 7 and 15% of fractions boiling be tween about 300 F. and 460 F.

2. The herein described marketable lubricating oil for cold weather use in automotive engines of the type in which liquid fuel enters the oil from the cylinders, clear in appearance, free from suspended solids, colloidal carbon and marked disagreeable odor, said oil having a viscosity of about 184 seconds Saybolt at 100 F., and on distillation showing a content of about 8% of fractions boiling between 300 F. and

3. The herein'described marketable lubricating oil for cold weather use inautomotive engines of the type in which liquid fuel enters the oil from the cylinders, clear in appearance, free from suspended solids, colloidal carbon and marked disagreeable odor, and characterized further by having a flash point above 150 F., a Say'bolt viscosity A of at least 140 at 100 F., a relatively low loss in viscosity durin use and a content of between 5 and 15% 0 fractions boiling between about 300 F. and 460 F.

LUTHER B. LOCKHART 

